Electric fuse



Dec. 2, 1930. w. J. JOHN ET AL 1,783,242

ELECTRIC FUSE Filed Jan. 5. 1929 Patented Dec. 2, 1930 UNITED STATESPATENT OFFICE WILLIAM JAMES JOHN, or onoynon, AND HERBERT WRIGHT, JR, orLennon, ENG- SAID WRIGHT, JR,

ASSIGNOR TO SAID JOHN ELECTRIC FUSE Application filed January 5, 1929,Serial No. 330,484, and in Great Britain January 6, 192 8.

This invention relates to electric fuses for high tension circuits andto that type or kind wherein the fuse wire is so connected to springsthat upon the wire melting its ends are snatched apart by the springs.

In our fuse we enclose the wire in a cartridge and fit caps to thecartridge enclosure and pass screw devices through the caps. These screwdevices are connected to the wire 1 inside the caps and to coiled bladesprings outside the caps. \Vhen the fuse wire melts one screw devicewith its remnant of wire is jerked out of the cap to one side by onespring and the cartridge with the caps and the other wire remnant isjerked to the other side by the other spring.

In the accompanying dra wing:- Fig. 1 is a part sectional side view ofone of our fuses, 7

Fig. 2 shows a detail of one of the springs. In this example a cartridge1 of refractory insulating material has fixed to it caps 2 and 3. Ascrew device at passes through the cap 2 and is fixed to the cap by'nuts5. Another screw device 6 is passed through cap 3 but is not attached tothe cap. The inner endsofthese screw devices are joined by fuse Wire 7.

Screw device 4 is connected to spring 10 by nut 8 and washer 9 whilstscrew device 6 is connected in much the same manner to spring 11. Bothsprings are under strain and are held by the fuse wire Immediately thewire melts spring 11 jerksscrew device 6 through hole 12 in the cape?)and carries the screw and such remnant of wire as may still be attachedto it in the direction of the adj acentarrow. Simultaneously with theremoval of the said screw device, the cartridge as a whole is jerked tothe other side as indicated by line and dot. To quench the are when thewire melts the cartridge may be filled with some material such as micadust 13.

Each spring is mounted at its coiled end on a stud 14 having slot 15 toreceive the inner end of the coil and suitably fixed as by nuts 16 onbracket 17 which is slotted at 18 to receive the stud, said bracketbeing fixed to stop-bracket 19.

WVhat we claim is:

1. An electric fuse for high tension circuits including a cartridgeenclosure, fuse terminals carried by the enclosure, a fuse wireconnecting the terminals within the enclosure, and means for bodilymoving the cartridge and one of said terminals in opposite directionsinthe event of rupture of the wire.

2. An electric fuse for high tension circuits including a cartridgeenclosure, fuse terminals carried by the enclosure, a fuse wireconnecting the terminals within the enclosure, and spring membersconnected respectively to the cartridge and to one of said terminals andacting on the rupture of the fuse wire to separate and bodily move thecartridge and said terminal relative to each other.

3. An electric fuse for high tension circuits, including a cartridgeenclosure, a terminal fixed to one end of the enclosure, a secondterminal arranged in and freely movable with respect to the other end ofthe en closure, a fuse wire connecting the terminals within theenclosure, and spring members connected respectively to the enclosureand to the free terminal and acting in the event of rupture of the. fusewire to bodily move the enclosure and free terminal in oppositedirections.

4. An electric fuse for high tension circuits, including a cartridgeenclosure, a terminal fixed to one end of the enclosure, 2. secondterminal arranged in and freely movable with respect to the other end ofthe enclosure, a fuse wire connecting the terminals within theenclosure, and spring members connected respectively to theenclosure andto the 'free terminal and acting. in the event of rupture of the fusewire to bodily move the enclosure and free terminal inoppositedirections, said spring members being included in the load circuit.

5. An electric fuse for high tension circuits including a cartridgeenclosure, a cap for each end of the enclosure, a terminal fixed withrespect to one-of the caps, a second terminal, freely slidable withrespect to the other of said caps, a fusewire connecting the terminalswithin theenclosure, and spring plates connected respectively to thefixed terminal and to the freely .slidable tertures.

minal, said sprig terminals acting on ru ture of the fuse wire to movethe freely SE54 able terminal and the cartridge enclosure relatively inopposite directions. 7

In testimony whereof we aifix our signa- \WILLIAM JAMES JOHN. ERBERTWRIGHT, JR.

